Bottom feed fuel bowl

ABSTRACT

An apparatus and method are provided for a fuel bowl to supply liquid fuel to a carburetor. The fuel bowl comprises a float chamber and a fuel inlet cavity which receives a fuel delivery insert. The fuel delivery insert receives a fuel inlet valve and comprises passages to direct incoming fuel to a bottom portion of the float chamber. A float comprises an elongate member rotatably hinged within a float cavity of the fuel delivery insert, such that the float rises according to a quantity of fuel within the float chamber. The fuel inlet valve supplies liquid fuel to the float chamber by way of the passages according to the operation of the float within the float chamber. A ventilation chamber allows air and fuel vapors to exit as liquid fuel enters the float chamber while preventing liquid fuel from entering into the carburetor.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of, and claims the benefit of, U.S.patent application Ser. No. 16/126,997 filed on Sep. 10, 2018 and U.S.patent application Ser. No. 15/429,035 filed on Feb. 9, 2017, issued asU.S. Pat. No. 10,087,888 on Oct. 2, 2018 and U.S. Patent Application,entitled “Bottom Feed Fuel Bowl,” filed on Oct. 7, 2014, and havingapplication Ser. No. 14/508,239, now issued as U.S. Pat. No. 9,581,111on Feb. 28, 2017, the entirety of which being incorporated herein byreference.

FIELD

The field of the present invention generally relates to fuel systems.More particularly, the field of the invention relates to an apparatusand a method for an improved fuel bowl assembly to supply a carburetorwith fuel.

BACKGROUND

A carburetor generally blends air and fuel for combustion within aninternal combustion engine. Typically, a carburetor comprises an openpipe, or throat, through which air is drawn into an intake of aninternal combustion engine, and a throttle valve to control the airflowthrough the carburetor. The throttle valve typically is of the butterflyvariety, comprising a rotatable disk within the throat of the carburetorand in operative communication with a throttle control of the engine.The butterfly valve may be rotated within the throat between a firstextremal position wherein the valve obstructs a large portion of theairflow into the intake and a second extremal position wherein thebutterfly valve offers very little resistance to incoming air, therebyallowing a maximal airflow into the intake.

A Venturi positioned above the butterfly valve generally comprises anarrow section within the throat wherein airflow through the carburetorincreases in speed. Fuel is introduced into the airflow through smallholes at the narrowest part of the Venturi. Fuel flow into the airflowis adjusted by way of precisely calibrated orifices, referred to asjets, positioned within a fuel reservoir, called a fuel bowl. Duringoperation, engine power and speed is controlled by way of the butterflyvalve, whereby positioning the butterfly valve at the first extremalposition limits the quantity of air and fuel introduced into the engine,and positioning the throttle valve at the second extremal positionallows a maximal quantity of air and fuel into the engine.

The fuel bowl typically comprises a float chamber which maintains aquantity of fuel at near-atmospheric pressure, ready for use. The floatchamber is constantly replenished by way of a fuel pump which suppliesfuel through an inlet valve. An advantageous fuel level is maintainedwithin the fuel bowl by way of a float controlling the inlet valve. Asfuel is drawn into the engine through the Venturi, the quantity of fuelin the float chamber decreases, causing the float to drop within floatchamber, thereby opening the inlet valve and allowing fuel to enter thefloat chamber. As the fuel level rises, the float rises within the floatchamber until the inlet valve is closed. Generally, ventilation tubesare used to allow atmospheric pressure to be maintained in the floatchamber as the fuel level changes. The ventilation tubes typicallyextend from the float chamber into the carburetor throat.

One drawback to conventional fuel bowls is that under somecircumstances, such as during acceleration, fuel may slosh out of thefloat chamber and into the carburetor throat, thereby giving rise toengine performance problems. Another drawback is that conventional inletvalves are position at the top of the float chamber, thereby allowingfuel to enter at the top of the fuel bowl. When fuel enters at the topof the fuel bowl, the fuel may become aerated which fills the fuel bowlwith fuel having a reduced density, thereby reducing engine performance.Still another drawback to conventional fuel bowls is that they aredesigned so as to have an airspace above the fuel level within the floatchamber, which allows the fuel to slosh around within the float chamber,thus leading to aeration of the fuel within the fuel bowl. What isneeded, therefore, is a fuel bowl which prevents aeration of the fuelwithin the float chamber.

SUMMARY

An apparatus and method are provided for a fuel bowl assembly to supplyliquid fuel to a carburetor. The fuel bowl assembly comprises a rigidbody comprising a float chamber, a fuel inlet cavity, and a mountingplate configured to fasten the fuel bowl assembly to the carburetor,such that the fuel bowl is in fluid communication with the carburetor. Afuel delivery insert is configured to be fastened within the fuel inletcavity, the fuel delivery insert is configured to receive a fuel inletvalve and comprises at least one passage to direct incoming fuel to abottom portion of the float chamber. A float comprises an elongatemember rotatably hinged within a float cavity of the fuel deliveryinsert, such that the float rises according to a quantity of fuel withinthe float chamber. The fuel inlet valve supplies liquid fuel to thefloat chamber by way of the at least one passage according to theoperation of the float within the float chamber. The float is biasedtoward the bottom portion of the float chamber by way of a springoperating on the elongate member. A ventilation chamber is in fluidcommunication with the float chamber and the carburetor, such that airis allowed to exit as liquid fuel enters the float chamber whilepreventing liquid fuel from entering into the carburetor.

In an exemplary embodiment, an apparatus for a fuel bowl assembly tosupply liquid fuel to a carburetor comprises a rigid body comprising afloat chamber, a fuel inlet cavity, and a mounting plate configured tofasten the fuel bowl assembly to the carburetor, such that the fuel bowlis in fluid communication with the carburetor; a fuel delivery insertconfigured to be fastened within the fuel inlet cavity, the fueldelivery insert configured to receive a fuel inlet valve and comprisingat least one passage to direct incoming fuel to a bottom portion of thefloat chamber; a float comprising an elongate member rotatably hingedwithin a float cavity of the fuel delivery insert, such that the floatrises according to a quantity of fuel within the float chamber, thefloat being biased toward the bottom portion of the float chamber by wayof a spring operating on the elongate mount; and a ventilation chamberin fluid communication with the float chamber and the carburetor, suchthat air is allowed to exit as liquid fuel enters the float chamber,wherein the ventilation chamber is configured to prevent the liquid fuelfrom entering into the carburetor; wherein the fuel inlet valve suppliesliquid fuel to the float chamber by way of the at least one passageaccording to the operation of the float within the float chamber.

In another exemplary embodiment, the rigid body further compriseswindows for viewing a position of the float within the float chamber. Inanother exemplary embodiment, the fuel inlet valve comprises a needleand seat, whereby the elongate member operates the fuel inlet valve byraising and lowering the needle according to the fuel level within thefloat chamber. In another exemplary embodiment, the fuel chamber isshaped to allow the entirety of the fuel chamber to fill with liquidfuel so as to substantially eliminate fuel aeration within the floatchamber, thereby ensuring that one or more calibrated orifices withinthe float chamber receive a steady supply of substantially unaeratedliquid fuel. In another exemplary embodiment, the ventilation chamber isconfigured to allow the float chamber to fill with liquid fuel whilesubstantially preventing liquid fuel from being drawn into thecarburetor.

In another exemplary embodiment, the fuel delivery insert comprises aninlet valve seat passing from a top of the fuel delivery insert to thefloat cavity, the inlet valve seat being configured to receive the fuelinlet valve, such that a needle of the fuel inlet valve is in contactwith the elongate member and a fuel outlet of the valve is aligned withthe at least one passage. In another exemplary embodiment, the at leastone passage extends from the inlet valve seat along a top of the fueldelivery insert, then extends along a back side of the fuel deliveryinsert, and then extends along the bottom of the fuel delivery insert tothe bottom portion of the float chamber. In another exemplaryembodiment, along the bottom of the fuel delivery insert, the at leastone passage separates into two individual passages extending to thebottom portion of the float chamber. In another exemplary embodiment,the at least one passage comprises dimensions and directions selected tofacilitate fabricating the fuel delivery insert out of a solid workpiece. In another exemplary embodiment, the float cavity comprises aheight and a width suitable to allow unobstructed movement of theelongate member as the float moves from the bottom portion to a topportion of the float chamber.

In an exemplary embodiment, an apparatus for a fuel system for providinga mixture of liquid fuel and air to an intake manifold of an internalcombustion engine comprises a carburetor mounted onto the intakemanifold by way of a spacer and suitable fasteners; one or more fuelbowls operating as a reservoir of liquid fuel for use by the carburetorduring operation of the internal combustion engine, each of the one ormore fuel bowls being fastened to the carburetor by way of suitablefasteners and a spacer; and a throttle linkage system facilitatingoperating the carburetor and the one or more fuel bowls to supply themixture of liquid fuel and air to the intake manifold, therebycontrolling the operation of the internal combustion engine.

In another exemplary embodiment, each of the one or more fuel bowlscomprises a float chamber, a fuel delivery insert, a float rotatablyhinged within the float chamber, and a ventilation chamber, the fueldelivery insert configured to receive a fuel inlet valve and comprisingat least one passage to direct incoming fuel from the fuel inlet valveto a bottom portion of the float chamber, the float being in operativecommunication with a fuel inlet value to maintain a quantity of fuelwithin the float chamber, the ventilation chamber being in communicationwith the float chamber and the carburetor, such that air is allowed toexit as liquid fuel enters the float chamber, wherein the ventilationchamber is configured to prevent the liquid fuel from entering into thecarburetor. In another exemplary embodiment, the float operates the fuelinlet valve by raising and lowering a needle within the fuel inlet valveaccording to the fuel level within the float chamber. In anotherexemplary embodiment, the fuel chamber is shaped to allow the entiretyof the fuel chamber to fill with liquid fuel so as to substantiallyeliminate fuel aeration within the float chamber, thereby ensuring thatone or more calibrated orifices within the float chamber receive asteady supply of substantially unaerated liquid fuel.

In an exemplary embodiment, a method for reducing aeration of liquidfuel within a fuel bowl of a carburetor comprises passing aerated fuelexiting a fuel inlet valve through one or more passages suitablydimensioned to allow the fuel to return to an unaerated state; directingunaerated liquid fuel from the one or more passages into a bottomportion of a float chamber; filling the entirety of the float chamberwith the unaerated liquid field venting air and fuel vapors within thefloat chamber into a ventilation chamber; and allowing the air and fuelvapors to pass from the ventilation chamber into the carburetor.

In another exemplary embodiment, directing aerated fuel through the oneor more passages causes the fuel to condense back to a liquid statebefore entering the float chamber. In another exemplary embodiment,filling the entirety of the float chamber substantially ensures that oneor more calibrated orifices receive a steady supply unaerated liquidfuel. In another exemplary embodiment, venting air and fuel vaporscomprises allowing the air and fuel vapors to exit the float chamber toa ventilation chamber as liquid fuel fills the float chamber. In anotherexemplary embodiment, allowing the air and fuel vapors to pass from theventilation chamber into the carburetor further comprises preventingliquid fuel from being drawn into the carburetor. In another exemplaryembodiment, passing aerated fuel further comprises placing the fuelinlet valve into operative communication with a float, such that thefloat operates the fuel inlet valve so as to maintain a quantity ofliquid fuel within the float chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings refer to embodiments of the present invention in which:

FIG. 1 illustrates an exemplary embodiment of a fuel system comprising acarburetor and two fuel bowls, according to the present disclosure;

FIG. 2 is a perspective view of an exemplary embodiment of a fuel bowland a fuel delivery insert in accordance with the present disclosure;

FIG. 3 is a perspective view of an exemplary embodiment of a fuel bowland a fuel delivery insert in accordance with the present disclosure;

FIG. 4 illustrates a top ghost view of an exemplary embodiment of thefuel bowl in accordance with the present disclosure;

FIG. 5 illustrates a side ghost view of an exemplary embodiment of afuel bowl, according to the present disclosure;

FIG. 6 illustrates a front ghost view of an exemplary embodiment of afuel bowl, according to the present disclosure;

FIG. 7 illustrates a bottom ghost view of an exemplary embodiment of afuel bowl in accordance with the present disclosure;

FIG. 8A is a perspective view of a back side of an exemplary embodimentof a fuel delivery insert, according to the present disclosure; and

FIG. 8B is a perspective view of a front side of an exemplary embodimentof a fuel delivery insert in accordance with the present disclosure.

While the present invention is subject to various modifications andalternative forms, specific embodiments thereof have been shown by wayof example in the drawings and will herein be described in detail. Theinvention should be understood to not be limited to the particular formsdisclosed, but on the contrary, the intention is to cover allmodifications, equivalents, and alternatives falling within the spiritand scope of the present invention.

DETAILED DESCRIPTION

In the following description, numerous specific details are set forth inorder to provide a thorough understanding of the present invention. Itwill be apparent, however, to one of ordinary skill in the art that thepresent invention may be practiced without these specific details. Inother instances, specific numeric references such as “first vent,” maybe made. However, the specific numeric reference should not beinterpreted as a literal sequential order but rather interpreted thatthe “first vent” is different than a “second vent.” Thus, the specificdetails set forth are merely exemplary. The specific details may bevaried from and still be contemplated to be within the spirit and scopeof the present invention. The term “coupled” is defined as meaningconnected either directly to the component or indirectly to thecomponent through another component. Further, as used herein, the terms“about,” “approximately,” or “substantially” for any numerical values orranges indicate a suitable dimensional tolerance that allows the part orcollection of components to function for its intended purpose asdescribed herein.

In general, the present invention describes an apparatus and a methodfor a fuel bowl to supply liquid fuel to a carburetor. The fuel bowlcomprises a float chamber and a fuel inlet cavity which receives a fueldelivery insert. The fuel delivery insert receives a fuel inlet valveand comprises passages to direct incoming fuel to a bottom portion ofthe float chamber. A float comprises an elongate member rotatably hingedwithin a float cavity of the fuel delivery insert, such that the floatrises according to a quantity of fuel within the float chamber. The fuelinlet valve supplies liquid fuel to the float chamber by way of thepassages according to the operation of the float within the floatchamber. A ventilation chamber allows air and fuel vapors to exit asliquid fuel enters the float chamber while preventing liquid fuel fromentering into the carburetor.

FIG. 1 illustrates an exemplary embodiment of a fuel system 100comprising a carburetor 104 and two fuel bowls 108, according to thepresent invention. Each of the fuel bowls 108 is fastened to thecarburetor 104 by way of suitable fasteners and a spacer 112. Thoseskilled in the art will recognize that the fuel bowl 108 operates as areservoir of liquid fuel for use by the carburetor 104 during operationof an internal combustion engine (ICE). The carburetor 104 is mountedonto an intake manifold 116 of the ICE by way of suitable fasteners anda spacer 120. A throttle linkage system 124 facilitates using thecarburetor 104 and fuel bowls 108 to supply a suitable mixture of airand fuel to the ICE, thereby enabling an operator of the fuel system 100to control the speed and power output of the ICE.

FIGS. 2-3 are perspective views of an exemplary embodiment of the fuelbowl 108 in accordance with the present disclosure. The fuel bowl 108generally comprises a rigid body 128 which includes a float chamber 132,a mounting plate 136, and a fuel inlet cavity 140. Preferably, the rigidbody 128 is formed of a material amenable to being machined, such as anyof a variety of metals. In an embodiment, the metal comprising the rigidbody 128 is 6061 aluminum. The mounting plate 136 is configured to bereceived by the spacer 112 and suitable fasteners, such that the fuelbowl 108 and the spacer 112 may be fastened to the carburetor 104, asillustrated in FIG. 1. The fuel inlet cavity 140 is configured toreceive a fuel delivery insert 144 as shown in FIG. 3. As best shown inFIGS. 4 and 5, the fuel delivery insert 144 is retained within the fuelinlet cavity 140 by way of fasteners 148 and 150.

As discussed in greater detail below, the fuel delivery insert 144receives a fuel inlet valve 152 configured to supply liquid fuel to thefloat chamber 132 according to the operation of a float 156 housedwithin the float chamber 132. As best illustrated in FIG. 5, a sideghost view of the fuel bowl 108, the float 156 comprises an elongatemember 160 which is rotatably attached to a float mount 164 within thefuel delivery insert 144. The float mount 164 generally comprises ashaft inserted into holes within the side walls of the fuel deliveryinert 144, as shown in FIGS. 5-6. A spring 168 biases the elongatemember 160 toward a bottom portion of the float chamber 132, such thatthe float 156 rises and drops strictly in accordance with the level offuel in the float chamber 132. As will be appreciated by those skilledin the art, the level and operation of the float 156 may be directlyobserved by way of windows 172 disposed in the walls of the floatchamber 132.

The fuel inlet valve 152 preferably is of the needle & seat variety,whereby the elongate member 160 operates the fuel inlet valve 152 byraising and lowering the needle according to the fuel level within thefloat chamber 132. As fuel is drawn out of the float chamber 132 by wayof one or more calibrated orifices 176, or jets, the float 156 dropsdownward as the level of fuel within the float chamber 132 decreases. Asbest illustrated in FIG. 5, when the float 156 assumes a low positionwithin the float chamber 132, the elongate member 160 lowers the needlewhich allows fuel to flow through the fuel inlet valve 152 into the fuelbowl 108. As fuel enters the fuel bowl 108, the float 156 rises in thefloat chamber 132 until the elongate member 160 shuts off the flow offuel through the fuel inlet valve 152. A ventilation chamber 180 allowsair to exit the fuel chamber 132 as the fuel level rises.

As will be appreciated by those skilled in the art, conventional fuelbowls are designed to maintain an airspace above the float, whileventilation tubes allow excess air to exit the float chamber and enterthe carburetor. Maintaining an airspace above the float allows liquidfuel to vaporize within the float chamber, thereby reducing the densityof the fuel provided by the fuel bowl to the carburetor. Unlikeconventional fuel bowls, however, the fuel chamber 132 of the presentdisclosure is advantageously shaped to allow the entirety of the fuelchamber 132 to fill with liquid fuel, thereby eliminating fuel aerationwithin the float chamber 132. Further, the ventilation chamber 180allows the float chamber 132 to fill completely with liquid fuel whileadvantageously preventing liquid fuel from sloshing into the carburetor104. As will be appreciated by those skilled in the art, the ventilationchamber 180 preferably is not completely closed off from the floatchamber 132, but rather the ventilation chamber 180 is isolated fromliquid fuel in the float chamber 132 while allowing air and fuel vaporsto escape from the float chamber 132 into the ventilation chamber 180.In an embodiment, the spacer 120 operates as a metering block comprisinga baffle that covers a lower portion of the ventilation chamber 180,thereby allowing air and fuel vapor to pass around the baffle and enterinto the ventilation chamber 180 while substantially preventing thepassage of liquid fuel. The air and fuel vapors in the ventilationchamber 180 are then passed to the carburetor 104 by way of suitablepassageways in the spacer 120.

As mentioned above, the fuel delivery insert 144 is retained within thefuel inlet cavity 140 by way of the fasteners 148 and 150. The fueldelivery insert 144 serves a dual function of placing the elongatedmember 160 in mechanical communication with the fuel inlet valve 152 anddirecting incoming liquid field to a bottom portion of the float chamber132. Those skilled in the art will recognize that liquid fuel typicallyflows from a fuel regulator at a pressure ranging between 3 PSI and 10PSI before passing though the fuel inlet valve 152. Liquid fuel existingthe needle & seat of the fuel inlet valve 152 has a tendency to becomeaerated with fuel vapors within the fuel bowl. The fuel vapors reducethe density of the fuel residing within the float chamber 132 andultimately entering into the ICE by way of the carburetor 104. In theembodiment illustrated in FIGS. 2-7, however, the fuel delivery insert144 directs fuel exiting the fuel inlet valve 152 through passages 184to the bottom of the float chamber 132. It will be appreciated thatdirecting aerated fuel through the passages 184 causes the fuel tocondense back to a liquid state before entering the float chamber 132.It will be further appreciated that directing only liquid fuel to thefloat chamber 132 advantageously ensures that the calibrated orifices176 receive a steady supply unaerated liquid fuel.

FIGS. 8A and 8B illustrate an exemplary embodiment of the fuel deliveryinsert 144 in absence of the fuel bowl 108. FIG. 8A is a perspectiveview of a back side 188 of the fuel delivery insert 144 which contacts arear interior surface of the fuel inlet cavity 140 when installed intothe fuel bowl 108, as illustrated in FIGS. 2-7. FIG. 8A illustrates apath of the passages 184 along the back side 188 of the fuel deliveryinsert 144. FIG. 8B is a perspective view of a front side 192 of thefuel delivery insert 144 which faces toward the float chamber 132 wheninstalled into the fuel bowl 108, as shown in FIGS. 3-7.

As best shown in FIG. 8B, the fuel delivery insert 144 comprises aninlet valve seat 196 passing from a top of the fuel delivery insert 144to a float cavity 200. The float cavity 200 comprises the float mount164 and a spring retainer 204. As discussed above, the float mount 164is configured to receive the rotatably mounted elongate member 160, andthe spring 168 biases the elongate member 160 toward a bottom portion ofthe float chamber 132. The spring retainer 204 is configured to ensurethat the spring 168 maintains a suitable degree of force on the elongatemember 160 throughout the range of motion of the float 156 within thefloat chamber 132. In the embodiment illustrated in FIGS. 8A-8B, thespring retainer 204 comprises a hole into which either an end of thespring 168 may be inserted or various fasteners suitable for holding theend of the spring fixed within the float cavity 200, as illustrated inFIGS. 5-6. It will be appreciated that the float cavity 200 possesses aheight and a width suitable to enable unobstructed movement of theelongate member 160 as the float 156 moves from the bottom portion to atop portion of the float chamber 132.

The inlet valve seat 196 is configured to receive the fuel inlet valve152, such that a needle of the fuel inlet valve 152 is in contact withthe elongate member 160, as shown in FIGS. 3-7, and a fuel outlet of thevalve is aligned with the passages 184. As discussed above, movement ofthe elongate member 160 moves the needle, thereby controlling fuel flowfrom the inlet valve 152 into the passages 184. Accordingly, it will beappreciated that the inlet valve seat 196 may comprise one or more sealssuitably configured to prevent liquid fuel from bypassing the passages184 and draining into the float cavity 200. In the embodimentillustrated in FIGS. 2-3, the inlet valve seat 196 is configured toreceive a fuel inlet valve which comprises preinstalled seals. It shouldbe understood that the inlet valve seat 196 preferably is designed andmachined in accordance with dimensions of the specific fuel inlet valveintended to be coupled with the fuel delivery insert 144, and thus thefuel delivery insert 144 may be implemented with a wide variety of inletvalve seats 196 comprising various diameters, depths, shapes, ridges,lips, protrusions, seals, and the like without deviating from the spiritand scope of the present disclosure.

In the embodiment of FIGS. 8A-8B, the passage 184 extends from the inletvalve seat 196 toward the back side 188 of the fuel delivery insert 144.As best shown in FIG. 8A, the passage 184 extends along the back side188 and then separates into two individual passages 184 toward a bottomof the fuel delivery insert 144. Along the bottom of the fuel deliveryinsert 144, the passages 184 are positioned on opposite sides of athreaded bolt hole 208 which is suitably configured to receive thefastener 150. In the illustrated embodiment of the fuel delivery insert144, the passage 184 comprises an open portion 212 along the back side188. It will be appreciated that upon installing the fuel deliveryinsert 144 into the fuel inlet cavity 140, the open portion 212 iscovered by a rear surface of the fuel inlet cavity 140. It will befurther appreciated that the open portion 212 serves to simplifyfabricating the fuel delivery insert 144 out of a solid work piece, suchas by way of non-limiting example, machined billet aluminum, machined6061 aluminum, and the like. It is to be understood that the specificdimensions and directions of the passages 184 may be altered from thoseillustrated in FIGS. 8A-8B without deviating from the spirit and scopeof the present disclosure.

While the invention has been described in tell is of particularvariations and illustrative figures, those of ordinary skill in the artwill recognize that the invention is not limited to the variations orfigures described. In addition, where methods and steps described aboveindicate certain events occurring in certain order, those of ordinaryskill in the art will recognize that the ordering of certain steps maybe modified and that such modifications are in accordance with thevariations of the invention. Additionally, certain of the steps may beperformed concurrently in a parallel process when possible, as well asperformed sequentially as described above. To the extent there arevariations of the invention, which are within the spirit of thedisclosure or equivalent to the inventions found in the claims, it isthe intent that this patent will cover those variations as well.Therefore, the present invention is to be understood as not limited bythe specific embodiments described herein, but only by scope of theappended claims.

What is claimed is:
 1. A fuel bowl for a carburetor, comprising: a floatchamber for holding a portion of liquid fuel for use by the carburetor;a fuel inlet valve for supplying the liquid fuel to the float chamber;one or more passages for directing the liquid fuel to a bottom portionof the float chamber; a float for closing the fuel inlet valve when thefloat chamber is full; and a ventilation chamber for allowing air andfuel vapors to exit the float chamber.
 2. The fuel bowl of claim 1,further including a fuel inlet cavity for receiving a fuel deliveryinsert that is configured to receive the fuel inlet valve.
 3. The fuelbowl of claim 2, wherein the fuel delivery insert includes a fuel inletvalve seat that extends from a top of the fuel delivery insert to afloat cavity.
 4. The fuel bowl of claim 3, wherein the fuel inlet seatis configured to place the fuel inlet valve in operative contact withthe float.
 5. The fuel bowl of claim 3, wherein the float is inmechanical communication with the fuel inlet valve by way of the floatcavity.
 6. The fuel bowl of claim 5, wherein the float is biased towarda bottom of the float chamber by way of a spring disposed in floatcavity.
 7. The fuel bowl of claim 6, wherein the float is configured torise according to a quantity of the liquid fuel within the floatchamber.
 8. The fuel bowl of claim 7, wherein the float is configured tooperate the fuel inlet valve in response to the quantity of liquid fuelin the float chamber.
 9. The fuel bowl of claim 2, wherein the fueldelivery insert comprises the one or more passages.
 10. The fuel bowl ofclaim 9, wherein the fuel inlet valve seat is configured to align a fueloutlet of the fuel inlet valve with the one or more passages.
 11. Thefuel bowl of claim 1, wherein the float chamber includes an interiorshape configured to substantially eliminate fuel aeration therein. 12.The fuel bowl of claim 11, wherein the interior shape is configured toallow substantially an entirety of the float chamber to fill with theliquid fuel.
 13. The fuel bowl of claim 12, wherein the interior shapeis adapted to ensure that one or more calibrated orifices within thefloat chamber receive a steady supply of substantially unaerated liquidfuel.
 14. The fuel bowl of claim 1, wherein the ventilation chamber isconfigured to allow the float chamber to substantially fill with theliquid fuel.
 15. The fuel bowl of claim 1, wherein the ventilationchamber is configured to prevent the liquid fuel from being drawn fromthe float chamber into the carburetor.